U.S. Secretary of State Hillary Clinton arrived in the Netherlands Monday for a conference on Afghanistan.

THE HAGUE, Netherlands (CNN) - Secretary of State Hillary Clinton was coy Monday about whether she would meet Iranian delegates at an international conference on Afghanistan, and she urged Tehran to play a positive role in helping stabilize its neighbor.

"I believe that there will be an opening by this conference that will enable all the countries, including Iran, to come forward," Clinton told reporters aboard her plane en route to The Hague for Tuesday's conference. "The fact that they accepted the invitation to come suggests that they believe there is a role for them to play, and we're looking forward to hearing more about that."

More than 80 countries and international organizations will be attending the conference, aimed at jump-starting political support for Afghanistan in the wake of the new U.S. strategy for the region, which President Obama announced last week. Clinton said she would be sharing the administration's policy review during the conference.

"We want to share the review in person with the friends and stakeholders in Afghanistan's future and encourage them to begin thinking hard about what each can do to support governance, security, economic assistance, regional cooperation, all of the necessary steps that we have to see fulfilled," she told reporters aboard her plane.